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A203900 as a simple table

na(n)
10
20
31
42
57
636
7391
817536
97520303
10134830884224
111016333764230127711
12137040823237740906153712364032
13139279234211744145176797121311869355242595356863

[0,0,1,2,7,36,391,17536,7520303,134830884224,
 1016333764230127711,
 137040823237740906153712364032,
 139279234211744145176797121311869355242595356863]